Lorenzo d



L. D. FAR-RA.

HEAT REGULATOR FOR STOVES OR FURNACES.

Patented Aug. 14, 1888.

WITNESSES:

UNITED STATES PATENT OFFICE.

toaENzo D. FARRA, or PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HORACE F. MoOANN, OF SAME PLAoE.

HEAT-REGULATDR "FOR s'Tovas oa FURNACES.

SPECIFICATION forming part of Letters Patent No. 387,713, dated August 14, 1888.

Application filed July 25, 1887. Serial No. 245.198. (No model.)

To all whom it may concern: I

Be it known that I, LORENZO D. FARRA, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Heat-Regulators for Stoves or Furnaces, which improvement is fully set forth in the following specification and accompanying drawings.

- Figure 1 represents a partial side. elevation and partial vertical section of a heat-regulator for furnaces embodyipg my invention. Fig. 2 represents a top or plan view of a portion thereof. Fig. 3 represents a side elevation of a modification. Fig. 4 represents a longitudinal section of another modification thereof.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists of improvements in heat-regulators for stoves or furnaces, as will be hereinafter fully set forth.

Referring to the drawings, A represents the casing of a stove or furnace of ordinary construction.

B represents a rod or column, which is supported at bottom on a floor plate or step, B, and passed loosely at top through a plate beam' or guide, B". Fitted on the column are arms or brackets B B, which are vertically adj ustable thereon and sustained in adjusted position by means of set-screws a.

C 0 represent two metallic tubes, preferably made of brass, which are secured at b ttom to the bracket 13 and at top to the ends of a lever, D, it being noticed that the tubes extend vertically and parallel, one of the tubes being'within the casing A and the other outside of the same.

E represents a lever, which has its fulcrum on the bracket 13. To the short arm of the lever E is attached a link, G, with which is connected the lever D. The long arm of the lever E has connected with it a rod, H, which passes freely through the lever, and has its upper end threaded for the attachment of a nut, J, between which and the rod is a coiled spring, K, which encircles the rod and bears against the lever and nut. The lower end of the rod H is connected to a lever, L, which is secured with a rock-shaft, M, the latter being mounted on a stove-pipe, as in Figs. 1 and 2, adjacent to the air-inlet N in said pipe. To the shaft M is secured the damper or valve P, which is adapted to cover and uncover said inlet N. In the long arm of the lever L are openings for the attachment of a weight, Q, whereby the damper or valve P may be balanced or adjusted.

In Fig. 3 the damper is shown above the opening N.

In Fig. 4 the rod H is shown as connected with a well-known check damper within a stove-pipe.

The tube 0 is exposed to the atmosphere outside of the building by means of a pipe, R, which leads from the atmosphere through a wall, window, &c.,.and directs air against the tube 0, said air descending and thus subjecting said tube to the action thereof. If desired, said pipe B may inclose said tube 0 from top to bottom, as shown by dotted lines.

In lieu of the tubes 0 C, I may use rods, which are, however, not as sensitive as tubes.

The tube 0, being firmly'attached at one end to the bracket B and at the upper end to one arm of the lever D, forms a fixed connection for said lever D. Now as the tube C is within the casing A, it expands and contracts, due to the variations of the temperature within said casing, whereby, owing to the lever D and link G, the long arm of the lever is either lowered or raised, the effect of which is to open or close the damper P and control the volume of air admitted to the stove-pipe, as in Figs. 1 and 2, or'into the stove below the grate, as in Fig. 3, or to open or close the damper within the pipe, as in Fig. 4. By these means should the fire become low or high, it will be restored to its proper condition; and thus maintained at an approximately uniform temperature.

Then the damper closes, should there be excessive upward strain on the long arm'of the lever E, the spring K yields, and said arm is accordingly relieved and the parts prevented from being injured.

If desired, the dampers shown in Figs. 1, 2, and 3 maybe connected with the lever E,both for adjusting the volume of air admitted into the stove-pipe and into the stove below the in the main by the expansion and contraction of the tube 0.

The column B provides a firm support for the brackets and connected parts and avoids strain on the casing, which is unable to endure the same without lracturc. Should the floor spring, the coluinn may yield in its loose connection at top, thus preventing injury to the device.

I am aware that it is common in automatic dampers to construct the actuating mechanism ol rods and levers,so arranged as to be operated by the expansion or contraction of a casing secured to a stove; but I am not aware that the peculiar construction set forth and claimed has ever before been used, except by me, as herein described, the said construction making a device strong and simple in character, efficient in operation, and one not easily liable to displacement of parts.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- r 1. An automatic heat-regulator, consisting of tubes, levers, a connectiug-rod,and damper, substantiallyasdescribed, in combination with a column having brackets vertically adjustable thereon and supporting said tubes and levers, substantially as described.

2. An automatic heat-regulator, consisting of tubes, levers, a connecting-rod,and damper, in combination with the column B, the brackets B" and B", vertically adj nstable on said column, the bracket B, sustaining the tubes of bracket B sustaining the supporting-lever of said automatic heat-regulator, and the bracket 3 supporting the tubes thereof, substantially as described.

4. A heat-regulator for a stove or furnace, consisting of two tubes secured to an arm or bracket, B, one of said tubes being within the casing of the stove or furnace, the lever D,connected with the upper ends of said tubes, the lcverE, pivoted toan arm or bracket, B, above said casing, and having its shorter arm connected by a link to said lever D, the rod H, the nut J, and spring K, the pivoted lever L, the rock-shaft M, with damper I, the weight Q, and a pipe having inlet N, said parts being combined substantially as described.

LORENZO I). FARRA.

Witnesses:

JonN A. Wnnn-msnl-nzn, A. 1. JENNINGS. 

